18813907 has 8 divisors (see below), whose sum is σ = 21671936. Its totient is φ = 15998472.

The previous prime is 18813863. The next prime is 18813913. The reversal of 18813907 is 70931881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18813907 - 2¹⁹ = 18289619 is a prime.

It is the 4338-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18813947) by changing a digit.

It is a nontrivial repunit in base 4337.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9693 + ... + 11470.

It is an arithmetic number, because the mean of its divisors is an integer number (2708992).

Almost surely, 2^18813907 is an apocalyptic number.

18813907 is a deficient number, since it is larger than the sum of its proper divisors (2858029).

18813907 is a wasteful number, since it uses less digits than its factorization.

18813907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21297.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 18813907 is about 4337.5000864553. The cubic root of 18813907 is about 265.9661281234.

The spelling of 18813907 in words is "eighteen million, eight hundred thirteen thousand, nine hundred seven".